131117977 has 2 divisors, whose sum is σ = 131117978. Its totient is φ = 131117976.

The previous prime is 131117971. The next prime is 131118023. The reversal of 131117977 is 779711131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97140736 + 33977241 = 9856^2 + 5829^2 .

It is a cyclic number.

It is not a de Polignac number, because 131117977 - 2⁷ = 131117849 is a prime.

It is not a weakly prime, because it can be changed into another prime (131117971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65558988 + 65558989.

It is an arithmetic number, because the mean of its divisors is an integer number (65558989).

Almost surely, 2^131117977 is an apocalyptic number.

It is an amenable number.

131117977 is a deficient number, since it is larger than the sum of its proper divisors (1).

131117977 is an equidigital number, since it uses as much as digits as its factorization.

131117977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9261, while the sum is 37.

The square root of 131117977 is about 11450.6758315830. The cubic root of 131117977 is about 508.0277241674.

The spelling of 131117977 in words is "one hundred thirty-one million, one hundred seventeen thousand, nine hundred seventy-seven".